pmccontrol.c revision 224057 
1/*-
2 * Copyright (c) 2003,2004 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/usr.sbin/pmccontrol/pmccontrol.c 224057 2011-07-15 11:30:41Z avg $");
30
31#include <sys/param.h>
32#include <sys/queue.h>
33#include <sys/sysctl.h>
34
35#include <assert.h>
36#include <err.h>
37#include <errno.h>
38#include <fcntl.h>
39#include <limits.h>
40#include <pmc.h>
41#include <stdarg.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <sysexits.h>
46#include <unistd.h>
47
48/* Compile time defaults */
49
50#define	PMCC_PRINT_USAGE	0
51#define	PMCC_PRINT_EVENTS	1
52#define	PMCC_LIST_STATE 	2
53#define	PMCC_ENABLE_DISABLE	3
54#define	PMCC_SHOW_STATISTICS	4
55
56#define	PMCC_CPU_ALL		-1
57#define	PMCC_CPU_WILDCARD	'*'
58
59#define	PMCC_PMC_ALL		-1
60#define	PMCC_PMC_WILDCARD	'*'
61
62#define	PMCC_OP_IGNORE		0
63#define	PMCC_OP_DISABLE		1
64#define	PMCC_OP_ENABLE		2
65
66#define	PMCC_PROGRAM_NAME	"pmccontrol"
67
68STAILQ_HEAD(pmcc_op_list, pmcc_op) head = STAILQ_HEAD_INITIALIZER(head);
69
70struct pmcc_op {
71	char	op_cpu;
72	char	op_pmc;
73	char	op_op;
74	STAILQ_ENTRY(pmcc_op) op_next;
75};
76
77/* Function Prototypes */
78#if	DEBUG
79static void	pmcc_init_debug(void);
80#endif
81
82static int	pmcc_do_list_state(void);
83static int	pmcc_do_enable_disable(struct pmcc_op_list *);
84static int	pmcc_do_list_events(void);
85
86/* Globals */
87
88static char usage_message[] =
89	"Usage:\n"
90	"       " PMCC_PROGRAM_NAME " -L\n"
91	"       " PMCC_PROGRAM_NAME " -l\n"
92	"       " PMCC_PROGRAM_NAME " -s\n"
93	"       " PMCC_PROGRAM_NAME " [-e pmc | -d pmc | -c cpu] ...";
94
95#if DEBUG
96FILE *debug_stream = NULL;
97#endif
98
99#if DEBUG
100#define DEBUG_MSG(...)					                \
101	(void) fprintf(debug_stream, "[pmccontrol] " __VA_ARGS__);
102#else
103#define DEBUG_MSG(m)		/*  */
104#endif /* !DEBUG */
105
106int pmc_syscall = -1;
107
108#define PMC_CALL(cmd, params)						\
109if ((error = syscall(pmc_syscall, PMC_OP_##cmd, (params))) != 0)	\
110{									\
111	DEBUG_MSG("ERROR: syscall [" #cmd "]");				\
112	exit(EX_OSERR);							\
113}
114
115#if DEBUG
116/* log debug messages to a separate file */
117static void
118pmcc_init_debug(void)
119{
120	char *fn;
121
122	fn = getenv("PMCCONTROL_DEBUG");
123	if (fn != NULL)
124	{
125		debug_stream = fopen(fn, "w");
126		if (debug_stream == NULL)
127			debug_stream = stderr;
128	} else
129		debug_stream = stderr;
130}
131#endif
132
133static int
134pmcc_do_enable_disable(struct pmcc_op_list *op_list)
135{
136	int c, error, i, j, ncpu, npmc, t;
137	struct pmcc_op *np;
138	unsigned char *map;
139	unsigned char op;
140	int cpu, pmc;
141
142	if ((ncpu = pmc_ncpu()) < 0)
143		err(EX_OSERR, "Unable to determine the number of cpus");
144
145	/* Determine the maximum number of PMCs in any CPU. */
146	npmc = 0;
147	for (c = 0; c < ncpu; c++) {
148		if ((t = pmc_npmc(c)) < 0)
149			err(EX_OSERR, "Unable to determine the number of "
150			    "PMCs in CPU %d", c);
151		npmc = t > npmc ? t : npmc;
152	}
153
154	if (npmc == 0)
155		errx(EX_CONFIG, "No PMCs found");
156
157	if ((map = malloc(npmc * ncpu)) == NULL)
158		err(EX_SOFTWARE, "Out of memory");
159
160	(void) memset(map, PMCC_OP_IGNORE, npmc*ncpu);
161
162	error = 0;
163	STAILQ_FOREACH(np, op_list, op_next) {
164
165		cpu = np->op_cpu;
166		pmc = np->op_pmc;
167		op  = np->op_op;
168
169		if (cpu >= ncpu)
170			errx(EX_DATAERR, "CPU id too large: \"%d\"", cpu);
171
172		if (pmc >= npmc)
173			errx(EX_DATAERR, "PMC id too large: \"%d\"", pmc);
174
175#define MARKMAP(M,C,P,V)	do {				\
176		*((M) + (C)*npmc + (P)) = (V);			\
177} while (0)
178
179#define	SET_PMCS(C,P,V)		do {				\
180		if ((P) == PMCC_PMC_ALL) {			\
181			for (j = 0; j < npmc; j++)		\
182				MARKMAP(map, (C), j, (V));	\
183		} else						\
184			MARKMAP(map, (C), (P), (V));		\
185} while (0)
186
187#define MAP(M,C,P)	(*((M) + (C)*npmc + (P)))
188
189		if (cpu == PMCC_CPU_ALL)
190			for (i = 0; i < ncpu; i++) {
191				SET_PMCS(i, pmc, op);
192			}
193		else
194			SET_PMCS(cpu, pmc, op);
195	}
196
197	/* Configure PMCS */
198	for (i = 0; i < ncpu; i++)
199		for (j = 0; j < npmc; j++) {
200			unsigned char b;
201
202			b = MAP(map, i, j);
203
204			error = 0;
205
206			if (b == PMCC_OP_ENABLE)
207				error = pmc_enable(i, j);
208			else if (b == PMCC_OP_DISABLE)
209				error = pmc_disable(i, j);
210
211			if (error < 0)
212				err(EX_OSERR, "%s of PMC %d on CPU %d failed",
213				    b == PMCC_OP_ENABLE ? "Enable" :
214				    "Disable", j, i);
215		}
216
217	return error;
218}
219
220static int
221pmcc_do_list_state(void)
222{
223	size_t dummy;
224	int c, cpu, n, npmc, ncpu;
225	unsigned int logical_cpus_mask;
226	struct pmc_info *pd;
227	struct pmc_pmcinfo *pi;
228	const struct pmc_cpuinfo *pc;
229
230	if (pmc_cpuinfo(&pc) != 0)
231		err(EX_OSERR, "Unable to determine CPU information");
232
233	printf("%d %s CPUs present, with %d PMCs per CPU\n", pc->pm_ncpu,
234	       pmc_name_of_cputype(pc->pm_cputype),
235		pc->pm_npmc);
236
237	dummy = sizeof(logical_cpus_mask);
238	if (sysctlbyname("machdep.logical_cpus_mask", &logical_cpus_mask,
239		&dummy, NULL, 0) < 0)
240		logical_cpus_mask = 0;
241
242	ncpu = pc->pm_ncpu;
243
244	for (c = cpu = 0; cpu < ncpu; cpu++) {
245#if	defined(__i386__) || defined(__amd64__)
246		if (pc->pm_cputype == PMC_CPU_INTEL_PIV &&
247		    (logical_cpus_mask & (1 << cpu)))
248			continue; /* skip P4-style 'logical' cpus */
249#endif
250		if (pmc_pmcinfo(cpu, &pi) < 0) {
251			if (errno == ENXIO)
252				continue;
253			err(EX_OSERR, "Unable to get PMC status for CPU %d",
254			    cpu);
255		}
256
257		printf("#CPU %d:\n", c++);
258		npmc = pmc_npmc(cpu);
259		printf("#N  NAME             CLASS  STATE    ROW-DISP\n");
260
261		for (n = 0; n < npmc; n++) {
262			pd = &pi->pm_pmcs[n];
263
264			printf(" %-2d %-16s %-6s %-8s %-10s",
265			    n,
266			    pd->pm_name,
267			    pmc_name_of_class(pd->pm_class),
268			    pd->pm_enabled ? "ENABLED" : "DISABLED",
269			    pmc_name_of_disposition(pd->pm_rowdisp));
270
271			if (pd->pm_ownerpid != -1) {
272			        printf(" (pid %d)", pd->pm_ownerpid);
273				printf(" %-32s",
274				    pmc_name_of_event(pd->pm_event));
275				if (PMC_IS_SAMPLING_MODE(pd->pm_mode))
276					printf(" (reload count %jd)",
277					    pd->pm_reloadcount);
278			}
279			printf("\n");
280		}
281		free(pi);
282	}
283	return 0;
284}
285
286static int
287pmcc_do_list_events(void)
288{
289	enum pmc_class c;
290	unsigned int i, j, nevents;
291	const char **eventnamelist;
292	const struct pmc_cpuinfo *ci;
293
294	if (pmc_cpuinfo(&ci) != 0)
295		err(EX_OSERR, "Unable to determine CPU information");
296
297	eventnamelist = NULL;
298
299	for (i = 0; i < ci->pm_nclass; i++) {
300		c = ci->pm_classes[i].pm_class;
301
302		printf("%s\n", pmc_name_of_class(c));
303		if (pmc_event_names_of_class(c, &eventnamelist, &nevents) < 0)
304			err(EX_OSERR, "ERROR: Cannot find information for "
305			    "event class \"%s\"", pmc_name_of_class(c));
306
307		for (j = 0; j < nevents; j++)
308			printf("\t%s\n", eventnamelist[j]);
309
310		free(eventnamelist);
311	}
312	return 0;
313}
314
315static int
316pmcc_show_statistics(void)
317{
318
319	struct pmc_driverstats gms;
320
321	if (pmc_get_driver_stats(&gms) < 0)
322		err(EX_OSERR, "ERROR: cannot retrieve driver statistics");
323
324	/*
325	 * Print statistics.
326	 */
327
328#define	PRINT(N,V)	(void) printf("%-40s %d\n", (N), gms.pm_##V)
329	PRINT("interrupts processed:", intr_processed);
330	PRINT("non-PMC interrupts:", intr_ignored);
331	PRINT("sampling stalls due to space shortages:", intr_bufferfull);
332	PRINT("system calls:", syscalls);
333	PRINT("system calls with errors:", syscall_errors);
334	PRINT("buffer requests:", buffer_requests);
335	PRINT("buffer requests failed:", buffer_requests_failed);
336	PRINT("sampling log sweeps:", log_sweeps);
337
338	return 0;
339}
340
341/*
342 * Main
343 */
344
345int
346main(int argc, char **argv)
347{
348	int error, command, currentcpu, option, pmc;
349	char *dummy;
350	struct pmcc_op *p;
351
352#if DEBUG
353	pmcc_init_debug();
354#endif
355
356	/* parse args */
357
358	currentcpu = PMCC_CPU_ALL;
359	command    = PMCC_PRINT_USAGE;
360	error      = 0;
361
362	STAILQ_INIT(&head);
363
364	while ((option = getopt(argc, argv, ":c:d:e:lLs")) != -1)
365		switch (option) {
366		case 'L':
367			if (command != PMCC_PRINT_USAGE) {
368				error = 1;
369				break;
370			}
371			command = PMCC_PRINT_EVENTS;
372			break;
373
374		case 'c':
375			if (command != PMCC_PRINT_USAGE &&
376			    command != PMCC_ENABLE_DISABLE) {
377				error = 1;
378				break;
379			}
380			command = PMCC_ENABLE_DISABLE;
381
382			if (*optarg == PMCC_CPU_WILDCARD)
383				currentcpu = PMCC_CPU_ALL;
384			else {
385				currentcpu = strtoul(optarg, &dummy, 0);
386				if (*dummy != '\0' || currentcpu < 0)
387					errx(EX_DATAERR,
388					    "\"%s\" is not a valid CPU id",
389					    optarg);
390			}
391			break;
392
393		case 'd':
394		case 'e':
395			if (command != PMCC_PRINT_USAGE &&
396			    command != PMCC_ENABLE_DISABLE) {
397				error = 1;
398				break;
399			}
400			command = PMCC_ENABLE_DISABLE;
401
402			if (*optarg == PMCC_PMC_WILDCARD)
403				pmc = PMCC_PMC_ALL;
404			else {
405				pmc = strtoul(optarg, &dummy, 0);
406				if (*dummy != '\0' || pmc < 0)
407					errx(EX_DATAERR,
408					    "\"%s\" is not a valid PMC id",
409					    optarg);
410			}
411
412			if ((p = malloc(sizeof(*p))) == NULL)
413				err(EX_SOFTWARE, "Out of memory");
414
415			p->op_cpu = currentcpu;
416			p->op_pmc = pmc;
417			p->op_op  = option == 'd' ? PMCC_OP_DISABLE :
418			    PMCC_OP_ENABLE;
419
420			STAILQ_INSERT_TAIL(&head, p, op_next);
421			break;
422
423		case 'l':
424			if (command != PMCC_PRINT_USAGE) {
425				error = 1;
426				break;
427			}
428			command = PMCC_LIST_STATE;
429			break;
430
431		case 's':
432			if (command != PMCC_PRINT_USAGE) {
433				error = 1;
434				break;
435			}
436			command = PMCC_SHOW_STATISTICS;
437			break;
438
439		case ':':
440			errx(EX_USAGE,
441			    "Missing argument to option '-%c'", optopt);
442			break;
443
444		case '?':
445			warnx("Unrecognized option \"-%c\"", optopt);
446			errx(EX_USAGE, usage_message);
447			break;
448
449		default:
450			error = 1;
451			break;
452
453		}
454
455	if (command == PMCC_PRINT_USAGE)
456		(void) errx(EX_USAGE, usage_message);
457
458	if (error)
459		exit(EX_USAGE);
460
461	if (pmc_init() < 0)
462		err(EX_UNAVAILABLE,
463		    "Initialization of the pmc(3) library failed");
464
465	switch (command) {
466	case PMCC_LIST_STATE:
467		error = pmcc_do_list_state();
468		break;
469	case PMCC_PRINT_EVENTS:
470		error = pmcc_do_list_events();
471		break;
472	case PMCC_SHOW_STATISTICS:
473		error = pmcc_show_statistics();
474		break;
475	case PMCC_ENABLE_DISABLE:
476		if (STAILQ_EMPTY(&head))
477			errx(EX_USAGE, "No PMCs specified to enable or disable");
478		error = pmcc_do_enable_disable(&head);
479		break;
480	default:
481		assert(0);
482
483	}
484
485	if (error != 0)
486		err(EX_OSERR, "Command failed");
487	exit(0);
488}
489